Air-compressor.



M. RIESNER.

AIR COMPRESSOR.

APPLICATION FILED MAR. 4. 1915.

Patented June 6, 1916.

2 SHEETSSHEET 1.

M. RIESNER.

AIR COMPRESSOR.

APPLICATION FILED MAR. 4.191s;

Patented June 6, 1916.

2 SHEETSSHE-ET 2.

fins? STAGE I000 iii/teases:

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MICHAEL RIESNER, or omomnnrr, OHIO, ASSIGNOR, BY Mnsnn nssxenmnmrs, r0

.' wonrnmemon rm AND 'MACHINERY coaromrromor NEW roan, N. 1., A

oonromrron or vmemra.

Application filed March 4,

To all whom it may concern.

Be it known that I, MICHAEL RmsNnR, a citizen of the United States, residing at Cmcinnati, county of Hamilton, .and State of Ohio, have invented certain new and useful Im 'rovements in Air-Compressors, fully de-' scrlbed and represented in the following 1 which the maximum bending moment upon the crank shaft in either direction shall be reduced, and in which the torque shall be the maximum load in one direction-reduced,

' gears during the entire cycle.

with consequent great reduction in the maximum bending moment on the common crank shaft.

The invention includes also a special arrangement of the second and third stage cranks relatively to each other and to the first stage crank, by which the torque is vention, and the features forming the invention then specifically pointed out in the claims.

In the drawing, Figure 1 is an elevation ofv the compressor longitudinally of the crank shaft. Fig. 2' is aisectional end ale vation looking to'the left in' Fig. 1. Fi 3' is a vertical-section throughthe cylin ers: lookin in the same direction as 'Flg. 1. 4 is a diagram showing the torque or cran Specification of Letters Patent.

am-oomnssdn.

1915. Serial No.11,950.

efi'ort curves of the three cylinders in dotted lines, andv the combined torque or crank eflort curve in full lines.

Referrin double actmg first stage or low pressure cyl nder, B, the second stage or intermediate cyl nder, C, the third stage or high pressure cyl nder, anda, b, 0, the respective plunge'rs, whlch splungers are connected toth'e crank shaft by cross-heads 10, connecting rods 11, and the cranks d, e, f, corresponding respectively, to the plungers a, b, c. The 071- inders are shown as provided, as usual, with water jackets 12,

manner.

supplied in any suitable' Any suitable valve movement 'and 'ar-I' rangement ofpiping and receivers may beused for the proper, supply and discharge STAT, Em mee.

Patented'June 6, 1 916 t0 the drawings: A isthe v v of fluid through the series of compressors.

A s shownfthe low pressure cylinder-is provided with rotating inlet valves 13, which .may be actuated from the crank shaft in any suitable manner, but automatic or other valves may be used. Automatic discharge valves 14 in discharge chambers 15, are

as provided with automatic suction and-discharge valves 16, 1.7. in suction-and discharge chambers 18, 19, on the head of the cylinder, and the third stage cylinders -.as provided with similar suction and discharge valves 20, 21 on head suction and dischar e cham-' bers 22, 23. The low pressure cylin or takes its suction air directly from the atmosphere through valves 13, and the air is discharged I from discharge chambers15 through pipes shown. The second stage cylinder is shown 7 24, which connect through pipe 25' with a suitable receiver (not shown), from which through p1pe 26, and the second stage cylin-v air is sup lied to the second stage cylinder 95.

der delivers through pipe 27 to a suitable.

receiver (not shown), from which air is supplied to the thirdstage cylinder through pipe 28, and'the. air finally delivered from '99;

the third stage cylinder through pipe 29..

';In. Fig. 4' is shown a'diagram the torque or crank effort curves in pounds throughout a rotation, for each of thethreestage pistons and the combined curve. Inthis drawing the curve of the first stage is stages in dot and dash lines, and the com-v bined curve in full lines.

105'- shown in dotted lines, the second and third a w is the torque or crank efiort curves shown by the load of the first stage plunger is. carried centrally of the crank shaft,'and the loads of the second stage and third stage plungers at the ends of the crank shaft near the end bearings, so that the load of the first stage plunger acts to reduce the maximum load in either direction produced on the crank shaft by the second and third stage plungers andthe maximum bending moment on the crank shaft is thus greatlyreduced. This arrangement is important in reducing the size and weight of crank shaft required, and securing a smooth action ofthe compressor, and, as shown, it makes possible the use of a crank shaft with only the twoend bearings, reducing the length of the crank shaft and dimensions of the compressor in this direction, This result of smooth action of the compressor is greatly aided also, and a more uniform torque and the absence of negative torque secured, by the arrangement of cranks shown, in which \the second and third stage cranks are arranged at an angle of 180 from each other, and the low pressure crank is arranged at 90 from the other two cranks. The result the diagram, Fig. 4, in which it will be seen that the combined torque or crank efi'ort curve of the three plungers, shown in full lines, is never below zero, so that there is always a positive forward pressure on the gears during the entirecycle.

It will be-understood th'atthe invention is not limited to the particular construction or arrangement of parts in the compressor illustrated as embodying the invention, but

that these may be changed widely without departing from the invention as defined by the claims. 1

What I claim is: 1. A three stage air compressor having a central double acting first stagecylinder, single acting second stage and third stage cylinders arranged on opposite sides of the first stage cylinder, a crank shaft common to the three cylinders, and separate cranks on the crank shaft for the plungers of the three cylinders.

2. A three stage air compressor having a central double acting first stage cylinder, single acting second stage and third stage cylinders arranged on opposite sides of the first stage cylinder, a crank shaft common to the three cylinders, and separate cranks onthe crank shaft for the plungers of the three cylinders, the cranks for the plungers of the second stage and third stage cylinders being arranged 180 apart, and the crank for the plunger of the first stage cylinder 90 from the other twocranks.r

3. A three stage air compressor having a double acting first stage cylinder, single acting second stage and thirdstage cylinders, a crank shaft common to the three cylinders, and separate cranks on the crank shaft for the plungers of the three cylinders, the cranks for the plungers of the second stage and third stage cylinders being arranged 180 apart, and the crank for the plunger of the first stage cylinder 90 from the other two cranks.

In-testimony whereof, I have hereunto set my hand,- in the presence of two subscribing witnesses.

' v MICHAEL RIESNER.- Witnesses: I ANNE '0. WERNER, V CARL Gr. WERNER. 

